Thunderbird 9 is Released (Ubuntu/Linux Mint)

Install Thunderbird 9 on  Ubuntu12.04/Ubuntu 11.10/Any Ubuntu Version/Linux Mint

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

What's New in Thunderbird
The latest version of Thunderbird has the following changes:

• Thunderbird is based on the new Mozilla Gecko 9 engine.
• New opt-in system for users to send performance and usability data back to Mozilla to improve future versions of Thunderbird.
• Additional support for Personas in the compose and address book windows.
• Better keyboard handling for attachments.
• Windows users can hide the menu bar (and show it with the "alt" key).
• Several user interface fixes and improvements.
• Fixed several security issues.

Note: Some People reports that ThunderBird 9 repository is Dead, So in this case Download Directly from ThunderBird Page.

To install Thunder Bird 9 on Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

Terminal Commands:
echo -e "\ndeb http://downloads.sourceforge.net/project/ubuntuzilla/mozilla/apt all main" | sudo tee -a /etc/apt/sources.list > /dev/null
sudo apt-get update
sudo apt-get install thunderbird-mozilla-build

If you want to install it on Other Linux Distro, Windows, or Mac. Go to This ThunderBird page.